The evil gods of Chaos tend to use fear and the promise of power immortality to motivate their warriors, but it turns out all they really need is an experience system and a linear series of unlocks. THQ are setting out to prove this with a new lump of paid DLC for Space Marine's recently added co-op survival mode, Exterminatus.

Exterminatus added two survival maps to Space Marine for free recently. Many Orks were slain. Much honour was gained in the eyes of the Emperor. Many badass assault packs were unlocked. The new Chaos Unleashed pack will cast you as the forces of Chaos, and will pit you against waves and waves of Imperial Guardsmen and Orks in new arenas. The pack also includes three multiplayer maps, Habs Ablaze, Station Tertius and Aquila Canyon. The pack will cost 800 Microsoft Points / £7.99 and will arrive in December.

THQ announce that they will also be selling Salamander, Alpha Legion, Legion of the Damned and Blood Angel skins at the hefty price of 240 Microsoft Points / £2.39 each.

If you're not tempted by any of this stuff, THQ say that the update will also add a capture the flag mutliplayer mode to Space Marine for everyone for free. A flag seems a little mundane for the Warhammer universe. Capture the Giant Robot Skull might be better, don't you think?